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Share-Based Compensation - Restricted Stock Activity (Details) - USD ($)
$ / shares in Units, $ in Millions
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Time-Based Restricted Stock Units      
Number of Units      
Beginning balance (in shares) 1,028,256    
Granted (in shares) 259,663    
Vested (in shares) (375,400)    
Forfeited (in shares) (137,846)    
Ending balance (in shares) 774,673    
Aggregate intrinsic value $ 25.1   $ 26.3
Performance-Based Restricted Stock Units      
Number of Units      
Beginning balance (in shares) 71,428    
Granted (in shares) 0    
Vested (in shares) (14,286)    
Forfeited (in shares) 0    
Ending balance (in shares) 57,142    
Aggregate intrinsic value $ 1.9   1.8
Market-Based Restricted Stock Units      
Number of Units      
Beginning balance (in shares) 587,500    
Granted (in shares) 243,168 524,000  
Vested (in shares) 0    
Forfeited (in shares) (41,031)    
Ending balance (in shares) 789,637    
Aggregate intrinsic value $ 25.6   $ 15.0
Restricted Stock Units      
Number of Units      
Vested awards (in shares) 627,890    
Vested awards, aggregate intrinsic value $ 20.4    
Vested awards, aggregate intrinsic value (in USD per share) $ 32.42    
Weighted average grant date fair value, awards granted (in USD per share) 33.23    
Weighted average grant date fair value, awards vested (in USD per share) 16.09    
Weighted average grant date fair value, awards forfeited (in USD per share) 16.36    
Weighted average grant date fair value, non-vested awards (in USD per share) $ 27.63    
Resigned Trustee | Restricted Stock Units      
Number of Units      
Vested awards (in shares) 568,753